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Mechanics-Oriented Coil Size Selection for an Internal Carotid Aneurysm With Fluid-Structure Interaction
Jiakun Han1, Na Zhao2, Wei Li3
1College of Sciences, Xi'an University of Science and Technology, Xi'an, China.
Summary
Coil size impacts brain aneurysm treatment. Optimal coil selection minimizes stress and displacement, improving outcomes for internal carotid artery aneurysms.
Area of Science:
- Biomedical Engineering
- Medical Physics
- Cardiovascular Research
Background:
- Coil intervention is a standard treatment for brain aneurysms.
- The influence of coil size on aneurysm hemodynamics and mechanics remains unclear.
Purpose of the Study:
- To investigate the effects of varying coil sizes on the hemodynamic and mechanical properties of internal carotid artery (ICA) aneurysms.
- To provide a theoretical basis for mechanics-oriented precision treatment in coil interventions.
Main Methods:
- Utilized a fluid-structure interaction (FSI) method with the Arbitrary Lagrangian-Eulerian (ALE) approach.
- Simulated non-Newtonian blood flow and linear elastic arterial walls.
- Employed computational fluid dynamics (CFD) to predict outcomes.
Main Results:
- Increasing coil size significantly reduced aneurysm wall shear stress (WSS), time-averaged WSS (TAWSS), and oscillatory shear index (OSI).
- Oversized coils led to parent artery compression, elevated TAWSS in adjacent branches, and aneurysm wall stress concentration.
- Aneurysm dome displacement and von Mises stress initially decreased then increased with coil size.
Conclusions:
- Appropriate coil sizing is crucial for minimizing aneurysm displacement and stress by managing blood flow velocity and vortices.
- Individualized treatment plans based on aneurysm morphology and hemodynamics are recommended.
- Findings support a shift towards mechanics-oriented precision treatment in coil interventions.
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